Hello. This is my first post here and I just started learning C, so please do not be too harsh in responces.
I was wondering how you can get system() or another function to call a system command and return the output not to STDOUT, but to a variable instead. This is so I may parse the output myself and print it how I wish to the user.
Thanks to anyone who provides valid info.
FILE *foo_output;
system ("foo.exe > foo_response");
foo_output = fopen ("foo_response", "rt");
// something like that?
hello, internet!
What operating system are you using?
If you are using Linux than the shell is powerful. Write a script.
If you are using Microsoft and VC++6 than you can use the system(" ..."); call in your program. You can also pass command line arguments to the program.
Use redirection:
ls /home/User > file.out
Last edited by Troll_King; 08-21-2002 at 07:28 AM.
Another approach is to use a pipe, if you have those functions available to you (they're non-standard). Be careful with this method though, sometimes the pipe will get stuck if things don't go right. Use with caution!
Code:/* This was written under Borland 5.5 */ #include <stdio.h> #include <stdlib.h> int main(void) { char buf[BUFSIZ]; FILE *fp; if ((fp = _popen("ping 127.0.0.1", "r")) == NULL) { perror("pipe failure"); return (EXIT_FAILURE); } while (fgets(buf, sizeof(buf), fp)) printf ("OUTPUT: %s\n", buf); _pclose(fp); return (EXIT_SUCCESS); }
When all else fails, read the instructions.
If you're posting code, use code tags: [code] /* insert code here */ [/code]
